JPS61186417A - Heat treatment of steel material - Google Patents
Heat treatment of steel materialInfo
- Publication number
- JPS61186417A JPS61186417A JP2566985A JP2566985A JPS61186417A JP S61186417 A JPS61186417 A JP S61186417A JP 2566985 A JP2566985 A JP 2566985A JP 2566985 A JP2566985 A JP 2566985A JP S61186417 A JPS61186417 A JP S61186417A
- Authority
- JP
- Japan
- Prior art keywords
- heat treatment
- scale
- steel
- alkali
- steel material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は主としてステンレス鋼に焼鈍等の熱処理を施こ
す鋼材の熱処理方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention mainly relates to a method of heat treatment of steel materials in which stainless steel is subjected to heat treatment such as annealing.
従来、ステンレス鋼等の鋼材に焼鈍等の熱処理を施すと
鋼材表面にはスケールが形成されるからこれを除去する
ためにHNO3−HF混合液、H(J。Conventionally, when heat treatment such as annealing is applied to steel materials such as stainless steel, scale is formed on the surface of the steel material, so in order to remove this scale, HNO3-HF mixed solution, H(J.
H2SO4等の脱スケール液に熱処理後の鋼材を浸漬し
ていた。The steel material after heat treatment was immersed in a descaling liquid such as H2SO4.
しかしながらスケールはこれら脱スケール液に不溶性で
あり上記脱スケール工程に先立ってスケールを脱スケー
ル液に可溶にするためのスケール改質工程が必要となる
。このようなスケール改質工程としては例えばNaHの
ソルトバスKM処理後の鋼材を浸漬するSodium
Hydride法やNa0H−NaNOaのソルトバス
に該鋼材を浸漬するHooker法等が提供されている
が、これら方法は溶融塩作成のために大きなエネルギー
を必要としかつ装置も大規模なものになる。However, scale is insoluble in these descaling solutions, and a scale modification step is required to make the scale soluble in the descaling solution prior to the above descaling step. Such a scale modification process includes, for example, a sodium bath in which the steel material after KM treatment is immersed in a NaH salt bath.
The Hydride method and the Hooker method in which the steel material is immersed in a Na0H-NaNOa salt bath have been proposed, but these methods require a large amount of energy to produce molten salt and require large-scale equipment.
本発明は上記従来の問題点を解決する手段として熱処理
に先立って鋼材表面にアルカリもしくは塩類を付着させ
るものであり、かくして本発明においては熱処理によっ
て生成するスケールが本来的に脱スケール剤に可溶とな
りスケール改質工程を全く必要とせずに簡単に脱スケー
ルが出来るようになるのである。The present invention solves the above-mentioned conventional problems by attaching alkali or salts to the surface of the steel material prior to heat treatment.Thus, in the present invention, the scale generated by heat treatment is inherently soluble in the descaling agent. Therefore, descaling can be easily performed without any need for a scale modification process.
本発明を以下に詳細に説明する。The invention will be explained in detail below.
本発明に用いられるアルカリとは水酸化ナトIJウム、
水酸化カリウム、水酸化カルシウム、水酸化マグネシウ
ム等の一般的な無機のアルカリであり、塩類とは炭酸ナ
トリウム、炭酸カリウム、硝酸ナトリウム、硝酸カリウ
ム、塩化ナトリウム。The alkali used in the present invention is sodium hydroxide,
Common inorganic alkalis such as potassium hydroxide, calcium hydroxide, and magnesium hydroxide, and salts include sodium carbonate, potassium carbonate, sodium nitrate, potassium nitrate, and sodium chloride.
塩化カリウム、硫酸ナトリウム、硫酸カリウム等の一般
的な金属塩が例示される。上記アルカリもしくは塩類は
二種以上混合されてもよく、ま友アルカリと塩類とを混
合してもよい。上記アルカリおよび/lたは塩類は通常
は水溶液とされ、該水溶液中に鋼材を浸漬するかまたは
該水溶液を鋼材表面にスプレーまたは刷毛mb等で塗布
する。Common metal salts such as potassium chloride, sodium sulfate, and potassium sulfate are exemplified. Two or more kinds of the alkalis or salts mentioned above may be mixed, or a mayu alkali and a salt may be mixed. The above-mentioned alkali and/or salts are usually made into an aqueous solution, and the steel material is immersed in the aqueous solution, or the aqueous solution is applied to the surface of the steel material by spraying, brushing, etc.
このようにして表面処理された鋼材は焼鈍等の所定の熱
処理を行なう。熱処理の温度は被処理鋼材の種類によっ
ても異なるが、例えばクロムステンレス鋼の場合には5
00〜1200℃の範囲が望ましく、更に650〜11
00°Cの範囲が望ましい。The steel material thus surface-treated is subjected to a predetermined heat treatment such as annealing. The heat treatment temperature varies depending on the type of steel material to be treated, but for example, in the case of chromium stainless steel, it is
The range is preferably 00 to 1200°C, more preferably 650 to 11
A range of 00°C is desirable.
〔作用〕
上記したように鋼材の表面にアルカリおよび/または塩
類を付着させた状態で熱処理を施こすとスケーノへ即ち
鋼材を構成する金属の酸化物とアルカリもしくは塩類と
が反応して可溶性の化合物となる。例えばクロムステン
レス鋼の場合にはスケールである酸化クロムCr2O3
が水酸化ナトリウムと次式のように反応して可溶化する
。[Operation] As mentioned above, when heat treatment is performed with alkali and/or salts attached to the surface of the steel material, oxides of the metals constituting the steel material react with the alkali or salts to form soluble compounds. becomes. For example, in the case of chromium stainless steel, chromium oxide Cr2O3 which is scale
is solubilized by reacting with sodium hydroxide as shown in the following equation.
CrzO3+2NaOH4NazCrzOn+HzO上
記反応は500″C以下の温度では反応速度が遅くなっ
て可溶性生成物NazCrz04の生成量が少なく、ま
た1200℃以上の温度ではNazCr204が液体化
して反応の進行が阻害される。CrzO3+2NaOH4NazCrzOn+HzO In the above reaction, at a temperature below 500''C, the reaction rate is slow and the amount of soluble product NazCrz04 produced is small, and at a temperature above 1200°C, NazCr204 liquefies and the progress of the reaction is inhibited.
熱処理に際して炉の雰囲気に5容量−以上の酸素を存在
させると上記スケールの可溶化反応が促進される。When 5 volumes or more of oxygen is present in the atmosphere of the furnace during the heat treatment, the scale solubilization reaction described above is promoted.
上記熱処理において可溶化したスケールは熱処理後に直
ちに団03−HF混合液、 HCl、 H2SO4等の
通常の脱スケール液によシ簡単に溶解除去することが出
来る。The scale solubilized in the above heat treatment can be easily dissolved and removed immediately after the heat treatment using a common descaling solution such as Group 03-HF mixed solution, HCl, H2SO4, etc.
本発明は上記し次ように鋼材表面にアルカリおよび/ま
たは塩類を付着させることは浸漬、スプレー、刷毛塗り
等の極めて簡単な装置で行なうことが出来、また付着の
ためのエネルギーも極く小さいものである。また熱処理
と同時にスケールを可溶化させるから熱処理後にあらた
めてスケール可溶化工程を設けることは全く必要なく工
程が短縮される。このように本発明は鋼材の熱処理工程
を大巾に合理化するものであシ、また本発明の方法によ
れば従来可溶化が困難とされてい次クロムステンレス鋼
のスケールも可溶化して容易に除去出来るのである。As described above, the present invention is capable of attaching alkali and/or salts to the surface of steel materials using extremely simple equipment such as dipping, spraying, or brush coating, and the energy required for the attachment is also extremely small. It is. Furthermore, since the scale is solubilized at the same time as the heat treatment, there is no need to carry out another scale solubilization step after the heat treatment, which shortens the process. In this way, the present invention greatly streamlines the heat treatment process for steel materials, and the method of the present invention also makes it possible to easily solubilize the scale of chromium stainless steel, which was conventionally difficult to solubilize. It can be removed.
以下に本発明を更に具体的に説明するための実施例につ
いて述べる。Examples for explaining the present invention in more detail will be described below.
鋼材としてはSUS 304およびSUS 430を用
いる。上記鋼材を径5.51)I長さ60ffの円筒状
に切断して試料とする。該試料を夫々炭酸ナトリウム水
溶液に常温で2分浸漬し、その後100°C10分間の
乾燥を行なう。このようにして炭酸ナトリウムを表面に
付着し次試料を熱処理炉に入れてアルゴン−酸素混合雰
囲気にて所定温度で1時間熱処理を行なう。熱処理後は
試料を冷却してからHF3重量%、HNO315重量%
の混合液に40°C×5分間浸漬して熱処理工程で試料
表面に生成したスケールを溶解除去した。その後試料表
面をブラッシングした後水洗し乾燥して試料表面を目視
によって観測して脱スケール性を評価した0第1表には
SUS 304と5US430との脱スケール性の比較
結果が記載される。SUS 304 and SUS 430 are used as the steel materials. The above steel material was cut into a cylindrical shape with a diameter of 5.51) I and a length of 60 ff to prepare a sample. Each sample was immersed in an aqueous sodium carbonate solution for 2 minutes at room temperature, and then dried at 100°C for 10 minutes. After the sodium carbonate was deposited on the surface in this manner, the sample was then placed in a heat treatment furnace and heat treated at a predetermined temperature in an argon-oxygen mixed atmosphere for one hour. After heat treatment, cool the sample and then add 3% by weight of HF and 15% by weight of HNO.
The sample was immersed in a mixed solution at 40°C for 5 minutes to dissolve and remove the scale generated on the sample surface during the heat treatment process. Thereafter, the sample surface was brushed, washed with water, dried, and the sample surface was visually observed to evaluate the descaling property.Table 1 shows the comparison results of the descaling property of SUS 304 and 5US430.
第1表
第1表のデータは熱処理温度750°C1酸素濃度10
容量チの条件で行われた熱処理に関するものである。第
1表によればステンレス鋼の種類によって脱スケール性
は影響を受けないことが明らかで、本発明の方法によれ
ば異なった種類の鋼材を同一ラインで熱処理出来ること
が示される。Table 1 The data in Table 1 is heat treatment temperature: 750°C, oxygen concentration: 10
This relates to heat treatment carried out under conditions of low capacity. According to Table 1, it is clear that the descaling property is not affected by the type of stainless steel, which shows that the method of the present invention allows different types of steel materials to be heat treated on the same line.
次に熱処理温度を750°Cとして5US430につい
て熱処理雰囲気中の酸素濃度を種々に変えた場合の脱ス
ケール性を第2表に示す0第2表によれば脱スケール性
は酸素濃度5容量チ以上の時望ましい結果を示す。Next, Table 2 shows the descaling properties of 5US430 when the heat treatment temperature was set to 750°C and the oxygen concentration in the heat treatment atmosphere was varied. Shows desired results when .
次に酸素濃度を10容量チとして5US430について
熱処理温度を種々に変えた場合の可溶化スケールである
Na 2 Cr2O4の試料1個あたシの生成量(1q
) を第1図に示す。第1図をみれば熱処理温度が50
0℃以上特に650°C以上、および1200°C以下
特に1100℃以下では可溶化スケールの生成量が急激
に上昇することがわかる。Next, the amount of Na 2 Cr 2 O 4 produced per sample (1 q
) is shown in Figure 1. If you look at Figure 1, the heat treatment temperature is 50
It can be seen that the amount of solubilized scale produced increases rapidly at temperatures above 0°C, especially above 650°C, and below 1200°C, especially below 1100°C.
第1図は熱処理温度(’C)と可溶化スケールの生成量
との関係を示すグラフである。
特許出願人 大同特殊鋼株式会社
4005006007C0800900100011C
X)1201) 1300熱処理温度(°C)FIG. 1 is a graph showing the relationship between the heat treatment temperature ('C) and the amount of solubilized scale produced. Patent applicant: Daido Steel Co., Ltd. 4005006007C0800900100011C
X) 1201) 1300 heat treatment temperature (°C)
Claims (1)
に熱処理炉に導入することを特徴とする鋼材の熱処理方
法A method for heat treatment of steel material, which comprises introducing alkali and/or salts onto the surface of the steel material and then introducing the material into a heat treatment furnace.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2566985A JPS61186417A (en) | 1985-02-12 | 1985-02-12 | Heat treatment of steel material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2566985A JPS61186417A (en) | 1985-02-12 | 1985-02-12 | Heat treatment of steel material |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61186417A true JPS61186417A (en) | 1986-08-20 |
Family
ID=12172189
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2566985A Pending JPS61186417A (en) | 1985-02-12 | 1985-02-12 | Heat treatment of steel material |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61186417A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6415383A (en) * | 1987-07-08 | 1989-01-19 | Tokuriki Honten Kk | Oxidation inhibiting solution |
JPS6415384A (en) * | 1987-07-08 | 1989-01-19 | Tokuriki Honten Kk | Oxidation inhibiting solution |
-
1985
- 1985-02-12 JP JP2566985A patent/JPS61186417A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6415383A (en) * | 1987-07-08 | 1989-01-19 | Tokuriki Honten Kk | Oxidation inhibiting solution |
JPS6415384A (en) * | 1987-07-08 | 1989-01-19 | Tokuriki Honten Kk | Oxidation inhibiting solution |
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